Neat

In bartending, the term straight up (or up) refers to an alcoholic drink that is shaken or stirred with ice, strained, and served in a stemmed glass. This is contrasted with[2] a drink served neat – a single, unmixed liquor served at room temperature without any water, ice or other mixer – and a drink served on the rocks – a drink served over ice, either an unmixed or a cocktail. Neat drinks and rocks drinks are often served in a rocks glass, but may be served in other glasses – a shot glass, a cocktail glass, or others.